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v PURNAGE; No'.- -320,56-3 Patented Jun-e 23. 1885....

, 1 /K J y /i///////////////////////////////////////////7 UNITED STATES PATENT OFFICE. a

XVILLIAM KENT, OF JERSEY CITY, NINV J ERSEY.

FURNACE.

EPECIFIOATION forming part of Letters Patent No. 3.2.0,563. dated June 23, 1885.

A pplication filed August 11, ISS-'1. (No model.)

hereby declare the following to be a full clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in furnaces and the method of setting steam-boilers; but more especially to those furnaces which use bituninous coal,

lignite, peat, Wood, or other fuel which contains large qnantities of tarry or gaseous matter, and in burning distils a large amount of conbustible gas, and has for its object to so construct and arrange the furnace that all of said gases will be eonsumed and the heat generated thereby utilized to the best advantage in the generation of steam; and with these ends in View my invention consists in the de tails of Construction and combination of elements hereinafter fully and in detail explained, and then specifically designated by the claims.

In order that those skilled in the art to which my invention appertains may more full y understand its Construction and adaptation, I will proceed to describe the same in detail, referring by letter to the accompanyng drawings, formi'ng a part of this specification, in which Figure l is a vertical section of my furnace as applied to an ordinary return tubular boiler, the latter being in elevation; Fig. 2, a ground plan; Fig. 3, a cross-section; Fig. 4:, a section of my furnacc as applied to a Babcock and YVilcoX or other water-tube boiler, and Fig. 5 a ground plan of the same.

Similar letters denote like parts in the several figures of the drawings.

Referring to Figs. l, 2, and 3, which show ny improved. furnace in connection with a return tubular boiler, A is the boiler, which is surrounded by a wall, B, of brick or other non-conducting material.

C is a roof of fire-brick, which extends just below the boiler nearly its entire length, and

which has perforations D, forning communication between the lower chanber of the furnace and the space next the boiler.

E is a roof ot' fire-brick extending over the firebox, and against which the direct rays of heat are projected froni the fire-bed on the grate F.

G is a passage forned by the roofs C and E, by which direct communication is formed between the outer atmosphere and the furnace. 'Dhe capacityof this passage may be regulated by any suitable sliding gate. lt will be 'un derstood that air passing through said passage will be heated before it reaches and mingles with the gases of comhustion.

H is the bridgewall, which is made just high enough to prevent any coal being accidentally thrown over it.

I J are fiame-walls 'extending 'from the bottoni of the furnace to the root' G, and forining a passage, K. equal to one-sixth of the gratesurface. Instead of these walls a single wall may be used having a sufiicient opening.

ln boilers as now set, especially those which have a large amount ot' heating-surface in proxinityto the grate, a large quantity of the gases distilled fron the uel becomes chilled below the temperature of ignition by contact with the sui-faces to be heated, and therefore pass off unconsuned, entailing a great waste as well as annoyance in clicking the tubes and chimney. To avoid this waste and annoyanee, it is necessary to insure the perfect ignition of the gases before they are allowed to touch the heating-surfaces of the boier. This may be accomplished hy igniting all the gases inside the conibustion-chamber and giving them a long distance to travel, requiring some length of tine for such travel, and this is acconplished by my invention, the operation of which is as follows:

In Figs. 1, 2, and 3 the furnace proper, with its grate-bars, is set some distance in front of the boiler, and is covered by the two fire-brick roofs G E. The gases rising from the fire-bed, together with the air which passes through .the grate-bars and that which is admitted through the passage Gr between the roofsCE, after passing over thebridge-wall H, meets an obstruction in the lame-walls I J, and are compelled to change their direction in the combustion-ohamber and pass through the narrow vertical passage K between the fiane-walls. After passing through this passage they are still prevented from reaching the boiler by the inner extension of roof C. By thus causing the gases to travel a circuitous route through the chambers surrounded with fire-brick they are thoroughly burned, and are in proper condition to give up all their beat of eombustion to the water in the boiler.

The perforations D serveto insure the heating of that portion of the boiler just above the roofC by allowing a portion ot' the gases to pass through to said boiler.

Figs. 4 and 5 show a modification of ny improvement as applied to water-tube boilers, and it differs from the above-described construetion in thatthefire-box is placed directly under the front end of the boiler, the gases of combustion being kept from immediate contact with the heating-surfaces by means of a layer ot'fi'e-briek, L, which forms a root' for the furnaee, and conpels the gases to pass over the bridgewall H, through the passageK, and around the baffle-plate M, which projects up at right anglesfron the 'oof L, and fron thenee in the direction ot" the arrows around the baflle-plate M, projecting down at right angles froni the upper layer of fire-brick O,

l. The combustion-chamber in the rear of 5 the furnaee, oovered by the roof C, in combination with the fiame-walls I J, placed in said combustion-chamber, substantially as shown and described.

2. In a water-tube steam-boler setting, the conbination of the roof O of the furnace, extending from the front to a point beyond the bridge-wall, the low bridge-wall H, and the flame-walls I J, substantially as shown and specified.

3. In a water-tubesteam-boiler, the arrangement of the rooi's L and O and the baffle-plates M and N, so as to' cause the products of combustion to travel under nearly the whole length of the boiler before entel-ing the uest of tubes,' as shown and specified.

In testinony Whereof I affix my signature in presence of two witnesses.

XVILLIAM KENT.

XVithesses:

ALBERT P. MORIARTY, ISAAC SIMONsON. 

